Removable guide for explosively fired fasteners



June 26, 1962 M. REYMOND 3,040,325

REMOVABLE GUIDE FOR EXPLOSIVELY FIRED FASTENERS Filed Nov. 22-, 1957 2 Sheets-Sheet 1 III/I A mln/ IIIIIIIIIIIIII.

QwVI/WM'Y'. Qhfcluel REyMo/vn Ho fmoy June 26, 1962 M. REYMOND 3,040,325

REMOVABLE GUIDE FOR BXPLOSIVELY FIRED FASTENERS Filed Nov. 22, 1957 2 Sheets-Sheet 2 IN'VENTOR Michel Raymond BY I) ATTORNEY nit Stat.atet

3,040,325 REMOVABLE GUEDE FUR EXPLOSIVELY Fhilll) FASTENERS Michel Reymond, fit-Etienne, France, assignor to Societe Civile dEtude tie Procedes de Elcellement, Saint- Etienne, France Filed Nov. 22, 1957, Ser. No. 695,260 Claims priority, applicationv France May 29, 1957 2 Claims. (Cl. 1-445) The easy operation and the like advantages of plugging and dowelling guns, the use of which is widely spread nowadays lead to a considerable range of applications for and it frequently occurs that it is deflected or broken and,

in fact, it is often necessary to allow an easier application I of the barrel by taking off the splinter protector from the gun which leads to a reduction in safety and to the necessity of dismantling and removing the gun.

Now, my improved fastener guides lead to a convenient and reliable use of the plugging and dowelling guns for the securing of shaped members or of members having a special outline. My improved fastener guides are preferably slidingly removable so that they may be instantaneously set in position or removed or else they may be temporarily made rigid with the gun through any suitable means. These fastener guides are perforated throughout so as to conform with the size of the barrel bore of which they form an extension and, furthermore, their rear ends are sized and shaped so that they may be centered with reference to the end of the barrel through a perfect alignment between their axial bore and the axis of the gun barrel, while the other end of said missile guide is sized and shaped for its ready engagement with the shaped parts or members to be secured, so that the axial bore aligned with the barrel bore may register with the surface of said shaped parts or members which are to be secured.

in order to properly describe the object of my invention, I have shown an embodiment thereof in the accompanying drawings given solely by way of exemplification. In saiddrawings:

FIG. 1 is a perspective view of a fastener guide according to my invention.

FIG. 2 is an axial cross-section of the end of a plugging and dowelling gun drawn in thin lines, the fastener guide according to FIG. 1 being inserted in said gun so as to engage in its driving position a U-shaped iron also drawn in thin lines.

FIG. 3 is an elevational shown in FIG. 2.

view of the fastener guide FIG. 4 is a sectional view passing through the axis of the fastener guide shown in FIG. 2, the actual fastener being drawn in interrupted lines.

FIG. 5 is an axial cross-section of a further embodiment of the fastener guide the bearing surface of which is not perpendicular to the axial perforation of the guide.

FIG. 6 is a perspective view of a further embodiment of the fastener guide to be used for the driving of L shaped angle-bars for instance.

FIG. 7 is an axial cross-section of the fastener guide shown in FIG. 6 as fitted at the end of the barrel of a plugging and dowelling gun.

FIGS. 8 and 9 illustrate a fastener guide provided with a washer-holding front recess or housing, according to an embodiment of my invention.

The above disclosed'features of my improved removable fastener guide permit fitting of the guide at one end on the plugging and dowelling gun slidingly and at the other end on the member to be secured to a compact mass, this being provided by the size and shape given to the guide which is made in one piece. Consequently, the examples described hereinafter with reference to the accompanying drawings are given solely so as to allow an easy understanding of the features of my invention without any limitation of any kind as concerns the embodiments and applications of the fastener guides falling Within the scope of the accompanying claims.

Turning to FIGS. 1 to 4, the fastener guide I intended for the securing of U-shaped members has a generally cylindrical shape. It is axially bored throughout as shown at 1 the diameter of the bore being equal to that of the bore in the gun barrel which is to cooperate with the guide. Conically bevelled edges are provided at 1 preferably at each end of the axial bore 1 The fastener guide is shaped so as to be provided with flat surfaces 1 adapted to be fitted in the gap formed between the flanges of U-shaped irons, so that it may engage the wall formed by the web of said irons. Cuts are provided at 1 to either side and to the rear of the fiat section between the surfaces 1 so as to increase the length of said section and to allow the fitting of the guide inside a U-shaped iron having broad flanges as in the case illustrated in FIG. 2.

The rear end of the fastener guide 1 is provided furthermore with a cylindrical bearing 5 having an outer surface I and. which is cylindrically recessed at 1 so as to fit accurately over the end of the barrel 0 of a plugging and dowelling gun (FIG. 4). The inner bearing surface 1 thus provided ensures the accurate centering of the fastener guide over the end of the barrel whereby a perfect alignment between the axis of the bore c1 in the barrel 0 and the axis of the bore 1 in the guide is obtained. It should again be mentioned that the gun, the end of which is illustrated in FIGS. 2 to 4, is shown by way of exemplification and with a view to an easier disclosure. In the case considered, the outer bearing surface 1 is obviously of a reduced diameter so as to leave a sufficient clearance with reference to the bore in the flame guard f carrying a splinter protector e.

There are also provided advantageously with a view to furthering the centering of the fastener guide over the end of the gun barrel, and also if required for facilitating the introduction of the bearing surface 1 inside the bore of the flame guard f, a bevelled element 1 at the rear end of the inner bearing surface 1 on the one hand and a further bevelled element '1 on the outer surface 1 on the other hand. Thus, even if the gun is positioned with a slight misalignment of the axis of the fastener guide with the axis of the gun, the bevelled surface elements 1' and 1 will provide for the proper alignment of the guide with the barrel.

In FIG. 4, it will be noticed that the inner bearing surface 1 is deep so that there is a gap g between the end of barrel c and the bottom of said bearing surface. This corresponds to the structure of the non-limiting example illustrated in which the safety in the use of the gun requires a forward thrust to be exerted on the gun towards the surface in which the driving is to beeffected with a view to operating stops which set the gun in a condition allowing the projection of the fastener. Obviously, the application of my improved fastener guides is not limited however to guns provided with safety means of this type.

The use and the interest of my improved fastener appear clearly from inspection of the drawings. In particular, the complete guiding of the fastener up to its point of impact into the mass to be driven into is apparent from inspection of FIG. 4 and therefore the driving is obtained reliably each time the gun is used.

The fastener guide 2 illustrated in FIG. shows the same features as the precedingly described fastener guide.

Its bearing surface 2 engaging the wall or the like surface in which the fastener is to be secured is however such that it forms an angle with reference to the axis of the axial bore 2 in said guide. This angular shaping of the end of the guide 2 allows as shown in FIG. 5 an easy securing of shaped members in the corners of a masonry work for instance, without it being necessary to dismantle the splinter protector e.

a A further modification of the fastener guide is illustrated in FIGS. 6 and 7, more particularly for securing L-shaped angle-bars for instance. The features already disclosed are again provided in this case, the difference residing solely in the shape of the guide 3 the cylindrical surface of which is notched at 3 so as to form a flat transverse surface allowing the passage under it of one of the angle-bar flanges. The fastener is perfectly guided until it enters the other flange of the angle-bar.

The removable fastener guide designed in accordance with my invention allows operating the gun without any modification in its barrel or in its mechanism and without it being necessary to dismantle the splinter and fire protector system if the gun is provided with such a system. As a consequence of the reliable guiding thus ensured up to the point of engagement with the surface to which a member is to be secured the driving operations are always perfectly executed.

The fastener guides may, within the scope of the invention defined by the accompanying claims (FIGS. 8 and 9), be designed in their ends bearing against the parts to be driven in such a manner that they may carry within a front housing or recess 19 coaxial with the bore of the guides, washers R for stopping the heads of the fastener P or again collars or the like parts to be secured together with the fastener.

'Finally, it should be mentioned that the fastener guides according to my invention are advantageously executed so as to allow instantaneous and easy removal while they may be readily and instantaneously fitted over the end of the barrel of a plugging and dowelling gun. However, it is also possible to provide means at the ends of the barrels and of the fastener guides, for instance, pins, sloping sectors, keys and the like for the transient assembly of the fastener guides with the end of the barrel of the gun.

Obviously and as already mentioned, my invention is by no means limited to the embodiments and applications which have been described more particularly hereinabove and it covers all the modifications thereof falling within the scope of the accompanying claims.

What I claim is:

1. In combination with a plugging and dowelling gun adapted to fire and drive a fastener through its barrel for securing onto a compact mass surface a shaped member including at least one upstanding wall perpendicular to said surface and a base wall parallel to said surface and through which said fastener is driven: a fastener guide made of a single piece having an elongated axial bore coaxial with the axis of the barrel and matching the size of the fasteners; the rear inner end of said gulide having a smooth inner cylindrical wall surface fitting slidingly over the outer end of the gun barrel for instant attachment to and removal from said outer end; at said rear end, beveled means for centering and aligning said guide with said barrel; said guide including at its front end a projecting section bounded laterally by at least one fiat surface parallel with the axis of the bore; said fiat surface fitting along an upstanding wall on the shaped member and said projecting section contacting said base wall.

2. In combination With a plugging and dowelling gun adapted to fire and drive a fastener through its barrel for securing a shaped member onto a compact mass surface, said member having at least one surface to be secured to said mass surface: a fastener guide made of a single piece having an elongated axial bore coaxial with the axis of the barrel and matching the size of the fastener; the rear end of said guide having a smooth inner cylindrical wall surface fitting slidingly over the outer end of the gun barrel for instant attachment to and removal from said outer end; at said rear end, beveled means.

for centering and aligning said axial bore with said barrel; the front end of said guide being adapted to come in contact with said shaped member; said guide having at its front end an annular recess coaxial with its core for insertion in said recess of a washer carried by the fastener upon firing and secured together with said shaped member.

References Cited in the file of this patent UNITED STATES PATENTS 2,673,980 Ballachey et al. Apr. 6, 1954 2,731,636 Bumiller Jan. 24, 1956 2,743,443 Catlin et al. May 1, 1956 2,863,149 Kopf et a1. Dec. 9, 1958 2,869,127 Williams Jan. 20, 1959 2,925,603 Pfaif et a1; 'Feb. 23, 1960 2,945,236 K'opf et a1. July 19, 1960 FOREIGN PATENTS 1 1,073,314 France Mar. 24, 1954 

